INNER CODE UNIT · Java

getInstance

getActivity/Toaster · library/src/main/java/com/hjq/toast/ActivityStack.java:19

    public static ActivityStack getInstance() {
        if(sInstance == null) {
            synchronized (ActivityStack.class) {
                if (sInstance == null) {
                    sInstance = new ActivityStack();
                }
            }
        }
        return sInstance;
    }

    /** 私有化构造函数 */
    private ActivityStack() {}

    /**
     * 注册 Activity 生命周期监听
     */
    public void register(Application application) {

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